Deaton, and Muellbauer. 1980. “An Almost Ideal Demand System”. American Economic Review 70 (3): 312-26. Reference Link
Deaton, and Muellbauer. 1986. “On Measuring Child Costs in Poor Countries (published under the title‘On Measuring Child Costs: With Applications to Poor Countries’”. Journal of Political Economy 94: 720-44. Reference Link